That's a sound point of contention; did Trump make such a statement with any staff present? Kash Patel states he was present when the president made a declassification declaration, but uncertain if that refers to Jan 19-20, 2021. I dislike the 'standing order' claim by Trump even if true, and don't argue it isn't a ruse but that we don't know. No one does NOT prefer the executive orderly execute his classification authority, I just don't see a procedural-slob exclusion.
Here's another - can a president by treating materials as unclassified, thus render them unclassified? If no, where is that constitutional limitation? Don't recall the origin. I think Trump has claimed he had a standing order of declassification for docs he'd take home/MAL during his presidency, but I can't reliably follow his stream of consciousness proclamations.
The classification system is established by executive orders of successive presidents (from FDR on) to dictate how everyone else handles material. Congress has three primary laws applying penalty to the system.
If the docs pertained to DOJ/FBI malfeasance re: Russia investigations, I'd rather those were public and him in jail, rather than being reacquired by DOJ.